One day, Captain Vancouver set sail for an exploration.  He was afraid his crew would get scurvy, a disease of lack of Vitamin C.  He wrote in his journal...

LOOK!  A BEAVER!  IT IS CUTTING DOWN A TREE!  IN THE WATER IS A SEA OTTER, SLEEPING ON ITS BACK.

His voyage was good.  He went to China and his journal got lost.  The end.